The CorTalk uDL1 is one of the industry’s smallest and toughest devices for collecting AC and DC measurements from cathodic protection systems. Designed to fit under standard CP test caps, this rechargeable device automatically begins operation when connected to a measurement cable and stores up to 2,000,000 readings.

Periodic field surveys of cathodic protection systems can’t identify frequent, short-term events that can seriously impact pipeline integrity. MOBILTEX data loggers solve this challenge with pocket-sized, highly accurate devices that are designed to be quickly installed inside rectifiers and test stations to measure and record critical performance parameters from the Cathodic Protection system.

Each device offers a wide range of configurable settings that includes sample rate, current measurement ranges, time, geo-location and more. A tough enclosure, combined with durable components provides reliable operation in the harshest of operating conditions, while a long-lasting rechargeable battery ensures months of operation.

Out of sight designCompact units fit inside most standard CP test stations
Maximum battery life Internal rechargeable batteries provide up to six months of continuous operation
Instantly view current dataLCD display for local measurement monitoring
Multiple memory optionsUp to 2,000,000 readings and a DC voltage waveform capture mode which samples at rate of 10 times per second
GPS accuracyInternal GPS receiver provides an accurate time reference and site geo-location coordinates
Easy to useFast, simple device configuration, data retrieval and charging via USB
Engineered to withstand the toughest conditionsLightning and surge protection, IP65 rated with broad operating temperature range ( -20°C to +60°C [ -4°F to +140°F ] )


Operating Temperature-20° to +60° C (-4° to +140° F)
Storage Temperature-40° to +70° C (-40° to +158° F)
Maximum Altitude5000 meters above sea level
Humidity0 to 100% RH non-condensing
Physical + Power
Weight75 grams (2.7 oz)
Size89mm x 40mm x 18mm (3.5” x 1.6” x 0.72”)
Power SourceRechargeable Internal Li-Ion (Not user replaceable)

Documents & software

MOBILTEX CorTalk uDL1 & uDL2Product Brochure ENGLISHPDF
MOBILTEX CorTalk uDL1 uDL2 ESProduct Brochure SPANISHPDF
MOBILTEX CorTalk uDL1 ManualCorTalk uDL1 Manual 1.07PDF
uDL1/2 Install Pack v1.0.0.20aConfiguration Application, Firmware and Drivers (uDL1 firmware v1.17)ZIP
uDL1 Config Apple iOS AppDownload from iTunesLink
uDL1 Config Android AppDownload from Play StoreLink
CorTalk Full Install Pack v1.0.0.23Download ZIP fileZIP
LTE Swap Apple iOS AppDownload from iTunesLink
LTE Swap Android AppDownload from Play StoreLink
CorView Apple iOS AppDownload from iTunesLink
CorView Android AppDownload from Play StoreLink

Frequently asked questions

Q: What is the difference between the Basic uDL1 and Advanced uDL1?

The Advanced uDL1 has additional features and functionality including:

  • Built in GPS
  • Periodic GPS clock synchronization
  • DC wave capture mode
  • Larger memory capacity
  • Interruption tracking (G2 model only)

Refer to the comparison chart below for further details:


Basic uDL1Advanced uDL1

Memory Size (samples)

500,0001,000,000 (G1) / 2,000,000 (G2)
Sampling IntervalBetween 1 second and 12 hours
  • Between 1 second and 12 hours
  • 10 times per second (DC Wave Capture mode)
  • Interruption Tracking (G2 only)

Q: What is the difference between the G1 and G2 Advanced uDL1?

The next generation of Advanced uDL1 utilizes new hardware with additional features. The primary improvement is the addition of interruption tracking. When this feature is enabled, you can program your interruption cycle parameters into the uDL1. The G2 uDL1 will record measurements during the On and Off cycles of your interruption survey.
The memory capacity for the Advanced uDL1 G2 is 2,000,000 samples (1,000,000 for the Advanced uDL1 G1). 

Q: What are the measurement ranges of the uDL1?

Low +/- 150mVDC, 110mV true RMS AC, 150mVpeak
Medium+/- 20VDC, 14V true RMS AC, 20Vpeak
High+/-150VDC, 106V true RMS AC, 150Vpeak



TitleImageDescriptionSKU (s)
Large Alligator ClipsAvailable in black and red.Mobiltex P/N H27400112BK (black)

Mobiltex P/N H27400112RD3748923 (red)

Cathodic Protection Monitoring Pipeline scene graphic illustrated in an isometric view
Cathodic Protection Monitoring Pipeline scene graphic illustrated in an isometric view


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Our industry-leading Sales, Technical Support, and Service teams are ready to take you from product selection to initial set-up and continue to provide dedicated support throughout the product lifecycle.


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